1. Department of Internal Medicine, Section of Internal and Cardiovascular MedicineUniversity of PerugiaPerugia Italy
2. Department of HaematologyUniversity of Cambridge, Cambridge Biomedical CampusCambridge UK
3. NIHR BioResource ‐ Rare Diseases, Cambridge Biomedical CampusCambridge University HospitalsCambridge UK
4. Department of Haematology, Addenbrooke's Hospital, Cambridge Biomedical CampusCambridge University Hospitals NHS Foundation TrustCambridge UK
5. Institute for Immunology and Transfusion MedicineUniversitätsmedizin Greifswald Ernst‐Moritz‐Arndt University GreifswaldGreifswald Germany
6. Transfusion MedicineMedical Faculty TübingenTübingen Germany
7. Hull York Medical SchoolUniversity of HullYork UK
8. The Katharine Dormandy Haemophilia Centre and Thrombosis UnitRoyal Free London NHS Foundation TrustLondon UK
9. Hematology/Oncology DepartmentHospital de Pediatría “Prof. Dr. Juan P. Garrahan”Buenos Aires Argentina
10. Servicio de Hematología y Hemoterapia HospitalUniversitario La Paz‐IDIPazMadrid Spain
11. Arthur Bloom Haemophilia Centre, Institute of Infection and Immunity, School of MedicineCardiff University UK
12. Department of Clinical Haematology, Oxford Haemophilia and Thrombosis CentreOxford University Hospitals NHS Trust, Churchill HospitalOxford UK
13. Oxford Haemophilia & Thrombosis Centre, Department of Haematology, Oxford University Hospitals NHS Trust, Churchill Hospital, Oxford and the NIHR BRC, Blood ThemeOxford Centre for HaematologyOxford UK
14. Beth Israel Deaconess Medical CenterHarvard Medical SchoolBoston Massachusetts
15. Churchill HospitalOxford University Hospitals UK
16. Department of PediatricsPerelman School of Medicine at the University of PennsylvaniaPhiladelphia Pennsylvania
17. Division of HematologyChildren's Hospital of PhiladelphiaPhiladelphia Pennsylvania
18. Basingstoke and Hampshire Hospital, NHS Foundation Trust UK
19. Hampshire Hospital NHS Foundation Trust UK
20. Centre for Haematology, Hammersmith Campus, Imperial College Academic Health Sciences CentreImperial College LondonLondon UK
21. Medical Research Council Biostatistics Unit, Cambridge Biomedical CampusCambridge Institute of Public HealthCambridge UK
22. School of Cellular and Molecular MedicineUniversity of BristolBristol UK
23. British Columbia Children's HospitalVancouver Canada
24. NIHR BioResource, Cambridge Biomedical CampusCambridge University HospitalsCambridge UK
25. Department of Cardiovascular Sciences, Center for Molecular and Vascular BiologyKU LeuvenLeuven Belgium
26. NHS Blood and TransplantCambridge Biomedical CampusCambridge UK
27. Wellcome Trust Genome CampusWellcome Trust Sanger InstituteCambridge UK